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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a9bc8af63b2412d9587f73b2376e36d9f3946954e3a6ec2b75472d35e40053b' 
  AND token = 'NVXrAdYDUo7gBfvUGkQyAyYLZygAIWB8cCubpQioYEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}